subsequent backups are hugely different in size

What is the backup type? Is it a "Files" backup or a "partition" backup or a "disk image" backup? These are the 3 choices offers when the backup task is first created and is the upper left corner of the main menu.

Please post a screen capture of your storage folder listing all the backup fioles.
It would also help to see a screen capture of the BACKUP OPTIONS/ backup scheme.

At the moment, we don't have enough information to comment.

Each backup is a backup of used disk sectors. If you be running any type of defrag, this can cause the backup size to increase even though no changes in files structure was made.

My intent was to make a complete backup of my main Drive C: The attachments are what I am looking at:

Tx, Uncle Dewey

Delete

Uncle Dewey,
Which version of Windows are you using

I don't know what you mean by
"I'm confused the 2014 seems to have all the same folders." The 2 newest backups are in a different folder than the ones from last year.

When posting a capture, it is much easier just to upload the picture into your posting rather than go to the trouble of including inside a doc file.

Only you being observant can answer your question as to why the difference in sizes. I am hoping that we can learn something from the attachments--which I an still requesting.

The attachments I am asking for is a picture of your storage folder which will show details about the two *.tib backup files. Be sure the picture includes their names, and sizes.
L:\MY BACKUPS\HP(C)\
You can get this by putting your mouse pointer inside the top task listed (HP (C) and click the location button. Also the

Also, the same for the tib files in the other task.

------------------------------------------------------------------
Do some comparing between the configuration of the two backup tasks which you captured.
Put you mouse inside the first backup task HP (C).
RIGHT clock on any open spot. An option window will open. Click on the "Edit settings" button.
When the task opens, observe which partition or disk boxes are checked as to what is to be included inside the backup. This will be the listing in the upper left quarter of the display.

Next, note in the lower right corner of the display, about one inch above the corner is the listing for the backup scheme. Click on the scheme name in blue. This will cause the backup scheme to open and will provide you with the name and details of the scheme. Your an do a screen capture which would get it all.

----------------------------
There is no backup scheme for the older task named "My Backups". But you can put your most pointer inside the older task (My Backup) and click the Recover button.
At this point, just be observant. The screen will provide a listing of what is available for recovery.
Note if the partitions available for recovery exactly match same partitions as listed for what is included in the HP(c) task? If yes, it would appear that both the old and new are the same.

Most likely one of the reasons you want a backup is to be able to recover from a virus or to be able to create a replacement disk --if yours fails. If true, I am NOT sure your current backup has those capabilities.
My suggestion at this point would be to stop using your current HP(c) task and create a new backup task.
Create a new sub-folder within your L:\MyBackups\folder such as "April Disk Image". The name is not important -just that you create a new folder to receive the backups from the new task.

When creating the new task, click on the option"select disk mode" as illustrated in my signature link 2 below and is the very first picture. This type backup will make certain that all you need to be able to create a replacement disk is included within the backup.

I don't know which type backup scheme you want to use. You may need to do so research. I have listed 3 options next. If you want to do a full and complete backup each backup, then you can select the full type scheme. Or, if you wish only the first to be the larger and the remaining others to be smaller, then select the Inc or Diff type. What is important about these example is that each uses the "automatic cleanup" method and will automatically delete the older backups once it reaches your selected number of backup to keep (store "X" number...)

GH11. Create Custom Full Backup Scheme.Keep 4 versions (chains).
GH12. Create Custom Incremental Backup Scheme. 6 Inc, Keep 4 chains.
GH13. Create Custom Differential Backup Scheme. 2 Diff, Keep 2 chains.

GH3. How to create a non-scheduled backup task on the first try.
GH4. Illustrate Manual Backup Now option.
GH5. How to delete backup files using Acronis Backup 'Explorer'
GH20. Remove Single Task from Task Menu Listing
GH39. How to custom folder/tib file name.

Hi Again Grover,

I've just gotten home from placing my wife in a skilled nursing facility. I'm going to be very busy for the next few days. I printed out your suggestions and will get back to them as soon as I can. I'm covered as at the same time I made a clone copy of my c:\ disk.

Thanks a bunch for your patience. Uncle Dewey

Yes, I would believe you are very busy. Her health is most important to you. Anytime in the future is ok.

I have found the culprit. I had my screen set to minimum size and then changed to maximum size screen and then saw "Incremental" at the bottom of the screen. So it was "walla" I needed to set a full backup which is why my latest backup was so small.

So sorry to bother you with such a simple problem--the smaller size should have triggered Incremental in my mind..

Uncle Dewey